FOOD CHEMISTRY
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2026
·
IF 10.4
Mingyue Yang,Zhiyu Zhang,Liuyan Yang,Yuntao Guan,Di Suo,Lixun Zhang
Rapid and accurate identification of heavy metals in food products is essential for ensuring food safety and public health. In this study, an electrochemical sensor based on nitrogen-doped hierarchical porous carbon nanospheres encapsulating ultrasmall PtBi nanoparticles (PtBi-HPCNs) was developed to enhance preconcentration and electrochemical deposition. The HPCNs provide abundant adsorption sites and effective mass transfer channels for metal ion enrichment, while the PtBi nanoalloys act as highly active electrocatalytic centers for metal ion reduction. Investigation of adsorption behavior and reduction kinetics reveals an “adsorption-assisted in-situ electrocatalytic reduction” mechanism. Leveraging these structural and electronic properties, the sensor enables sensitive and selective detection of Cd 2+ and Hg 2+ with low detection limits of 0.253 nM and 0.381 nM, respectively, well below Chinese regulatory limits. When applied to actual food sample detection, satisfactory recoveries of 96.80–104.53% were obtained, demonstrating its potential for practical monitoring of trace heavy metal ions in food.
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Journal of Materials Chemistry B
·
2018
·Vol. 6
·期 30
·4995-5002
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IF 4.776
Fei Qu,Lingyun Zhao,Wenli Han,Jinmao You
Glutathione–Au nanoclusters (GSH–AuNCs) are known as typical luminophores with aggregation-induced emission (AIE) features, which can be triggered by low temperature, low pH values, and metal ions. However, these strict “triggers” restrict the application of this AIE probe under mild and neutral conditions. In this work, fluorescent amino-modified silicon nanoparticles (SiNPs) and GSH–AuNCs can self-assemble into well-designed nanospheres through electrostatic interactions under physiological conditions. The hybrid probe of SiNPs@GSH–AuNCs exhibits dual emissions located at 450 nm from SiNPs and 570 nm originating from the aggregation enhanced emission (AEE) of GSH–AuNCs. Interestingly, the addition of Zn2+ or Cd2+ can connect the nanospheres to form large aggregates, so a unique second increase of AEE from GSH–AuNCs appears, while the emission of SiNPs remains constant to act as an internal reference. The fluorescence ratios (I570/I450) of SiNPs@GSH–AuNCs are positively correlated with Zn2+ or Cd2+ with the linear range from 1.5 μM to 500 μM. Most importantly, besides the advantages of dual emissions, high fluorescence brightness, and good stability, the SiNPs@GSH–AuNCs also exhibit excellent biocompatibility and low cytotoxicity, and have been successfully applied in zinc imaging in live cells. Furthermore, the proposed method is also used to measure Zn2+ and Cd2+ in real samples with satisfactory recoveries.
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IRANIAN POLYMER JOURNAL
·
2023
·
IF 3.1
Zou Yilong
Heavy metal pollution is a global environmental threat that jeopardizes both human health and ecosystems. To combat this issue, the adsorption method has emerged as a cost-effective, efficient, and environmentally friendly solution. Hydrogels, three-dimensional hydrophilic polymer networks, display remarkable swelling and adsorption capabilities, making them superior to other adsorbents. They facilitate easier adsorbate transfer, resulting in enhanced adsorption efficiency. This study introduces a novel, energy-efficient approach for crafting metal-ion hydrogel adsorbents. The process involved grafting catechol groups onto chitosan (CS-CH) and then forming a hydrogel through a Schiff base reaction between CS-CH and oxidized carboxymethyl cellulose (OCMC). Successful hydrogel formation was confirmed using FTIR and UV–Vis spectroscopies. The hydrogel’s dual interaction mechanism, facilitated by catechol and amine groups, enhanced its pollutant-binding capacity. Under optimal conditions (pH = 7) and a 180-min adsorption period, the OCMC/CS-CH hydrogels exhibited significant practical adsorption efficiencies: 89.6% for Cu 2+ , 80.5% for Cd 2+ , and 91.8% for Pb 2+ ions. Subsequent experiments reaffirmed its exceptional adsorption performance for these ions. Notably, the hydrogel maintained its efficacy even after five cycles of adsorption and desorption in 0.1 mol/L HCl, showcasing its impressive regeneration potential. Collectively, the straightforward fabrication process, consistent performance, and negligible secondary pollution make this hydrogel a promising candidate for a wide array of applications in addressing heavy metal contamination. Graphical abstract
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CHEMOSPHERE
·
2021
·
IF 7.086
Xin-Yu Wang,Yang Hao,Hong-Bo Zhao,Yuan-Ru Guo,Qing-Jiang Pan
The interfacial chemistry of nanocomposite materials is of overarching importance in the separation and purification science; moreover, its understanding helps to guide synthesis, clarify structure-property relationship and unearth novel applications. However, the composites feature rather complicated local structures and hydrogen bonds are often involved in the interface and the vicinity of active sites. In this regard, density functional theory first-principle calculations associated with experimental study have synergistically examined two-dimensional (2D) magnesium hydroxide material with different layers and their adsorption toward cellobiose. Hydrogen bonds are found responsible for the interfacial coupling, which make it vital to cover the dispersion correction in the calculation. The average adsorption energy ranges from −0.29 to −0.35 eV, falling well within the range of reported hydrogen-bonding strength. On the basis of calculated structural/interfacial properties and experimental findings, the 2D Mg(OH) 2 in terms of three-layer model was unraveled to substitute toxic Cd 2+ ion and sorb radioactive UO 2 2+ that is coordinated by water and hydroxyl groups. These reactions are thermodynamically feasible. The ion-exchanging mechanism was proposed for cadmium removal and the outer-sphere adsorption one for uranium extraction.
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JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Xiaowen Zhou,Zhonglong Wang,Xiaoqin Yang,Xiaoping Rao,Ping Zhao,Qian Jiang
Cadmium ion (Cd²⁺) and phosphate hydrogen ion (HPO₄²⁻) are widely applied in our production and life, which are closely related to human health and environmental protection. Herein, leveraging the structural merits of isoborneol, a novel fluorescence probe IB-CdP has been designed and developed for sequential detection of Cd²⁺ and HPO₄²⁻. Upon interaction with Cd²⁺, IB-CdP exhibits a significant fluorescence enhancement at 530 nm, which is subsequently quenched by the addition of HPO₄²⁻. This probe achieves ultra-low detection limits (28.61 nM for Cd²⁺ and 30.89 nM for HPO₄²⁻) and rapid response times. In addition, practical applications results confirmed the reliability of probe IB-CdP in water samples analysis and cell imaging studies, demonstrating its extensive application in environmental monitoring and biomedical research.
研究领域:
环境监测
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分析化学
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生物医学成像
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传感器与探针
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2021
·
IF 6.789
Qiang Zeng,Wei Sun,Hui Zhong,Zhiguo He
Taking low cost silicate minerals to develop efficient Cd 2+ adsorption materials was favorable to the comprehensive utilization of minerals and remediation of environmental pollution . In this study, a composite of silicon supported nano iron/aluminum/magnesium (hydr)oxides was prepared with biotite by combining acid leaching and base precipitation process , which was used to remove Cd 2+ . Cd 2+ adsorption behaviors were in accordance of pseudo-second order kinetic model and Langmuir model, and the obtained maximal Cd 2+ adsorption capacity was 78.37 mg/g. Increasing pH and temperature could accelerate the removal of Cd 2+ . The activation energy was calculated as 66.05 kJ/mol, meaning that Cd 2+ removal process was mainly depended on chemical adsorption . XRD and SEM results showed that this composite was a micro-nano structure of layered silica supported nano iron/aluminum/magnesium (hydr)oxides. Cd 2+ removal mechanisms were consisted of surface complexation and ion exchange between Cd 2+ and other metal ions , and the ion exchange interaction played the major role. These results indicated that a novel efficient utilization way for silicate minerals was developed.
研究领域:
环境科学
·
材料科学
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Biocatalysis and Agricultural Biotechnology
·
2026
·
IF 4.6
Yining Liu,Minhui Song,Yuanyuan Zhu,Yujia Zhai,Youjuan Xing
This study investigated the co-hydrothermal carbonization (co-HTC) of corn straw (CS) and brewer's spent grain (BSG) to produce nitrogen-rich hydrochars for enhanced Cd 2+ immobilization. Experiments were conducted at temperatures of 180-260 °C and residence times of 2-6 h. Results show that increasing reaction severity leads to the enrichment of carbon and nitrogen, reaching maximum contents of 59.59% and 2.72%, respectively, at 260 °C for 4 h. The peak specific surface area (5.96 m 2 /g) was achieved under moderate conditions (220 °C, 2 h). Mechanistically, XPS and FTIR characterizations confirm that co-HTC facilitates the transformation of proteinaceous nitrogen into stable aromatic heterocycles, including pyridinic-N, pyrrolic-N, and quaternary-N. These nitrogen-containing functional groups serve as crucial active sites, enhancing Cd 2+ binding via surface complexation and ion exchange. Adsorption analysis indicates that the process follows the Langmuir model (R 2 = 0.9468-0.9902) and pseudo-second-order kinetics (R 2 = 0.9994), signifying a monolayer chemisorption mechanism. The hydrochar produced at 220 °C for 6 h exhibited the highest adsorption capacity of 7.63 mg/g. This research provides a theoretical foundation for tailoring nitrogen functionalities in hydrochars to optimize heavy metal remediation in contaminated soils.
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Yingyun Luo,Zhuoya Meng,Jingwei Jiang,Yiyi Zhou,Yujia Chen,Ming Dong,Meiyi Xie,Peihan Xie,Mei Wang
A new electrochemical sensor based on a nanocomposites (Ce-MOF/Ti 3 C 2 ) synthesized by cerium-based metal-organic framework (Ce-MOF) and titanium carbide (Ti 3 C 2 ) was constructed. Ce-MOF/Ti 3 C 2 modified a glassy carbon electrode (GCE) to enable the individual or simultaneous trace detection of Cd 2+ and Pb 2+ by square wave anodic stripping voltammetry (SWASV). The morphology and composition of the composite were characterized using SEM, XPS and XRD, while its electrochemical performance was evaluated by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The developed sensor exhibited excellent performance, enabling simultaneous detection of Pb 2+ (8-500 μg/L) and Cd 2+ (10-500 μg/L), with detection limits of 1.02 μg/L and 2.5 μg/L, respectively, and also demonstrated good anti-interference capability, reproducibility and stability. This new method was successfully applied for the detection of Cd 2+ and Pb 2+ in river water and human urine samples, highlighting its potential for environmental and biological monitoring applications.
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ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Yanli Qi,Xiaolong Chen,Danqun Huo,Huan Liu,Mei Yang,Changjun Hou
Cd 2+ and Pb 2+ are two typical metallic pollutants in food. Therefore, it is of great significance to establish a method which can simultaneously detect them. Here, an electrochemical sensor was established to simultaneously detect Cd 2+ and Pb 2+ in food samples based on sensing electrode prepared by conductive carbon paper, rGO and CoZn·MOF (CP-rGO-CoZn·MOF). Under the optimized conditions, the proposed electrochemical sensor achieves simultaneous detection of Cd 2+ and Pb 2+ low to 0.565 nM (Cd 2+ ) and 0.588 nM (Pb 2+ ), respectively. Further selective experiments and repetitive experiments perform well. Spiked experiments find that the recovery rates of Cd 2+ and Pb 2+ in food samples are between 97.5% to 105.9% and 94.3%–109.6%, indicating the established electrochemical sensor owns a good response to the targets. Besides, relative standard deviations (RSD) of them are no more than 5.817%, showing its potential in practical applications.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Rui Dang,Xiang-Rong Ma,Yun-Peng Zhao,Menjiao Ren,Wei Guo,Yu-Hong Kang,Yong Gao,Shiqing Bi,Wenwen Gao,Hua-Rui Hao,Rui Bai,Yu-Fei Wang,LongYan,Liguo Gao,Zhi-Fang Zhang,Ya-Jun Ma,Xian-Yong Wei
The construction of three-dimensional (3D) Ni 2+ -Al 3+ -LDH / γ-Fe 2 O 3 - Cd 2+ -Ni 2+ -Fe 3+ -layered double hydroxide (LDH) structures (S1–S6) with magnetic properties and different (γ-Fe 2 O 3 - Cd 2+ -Ni 2+ -Fe 3+ -LDH)/(Ni 2+ -Al 3+ -LDH) ratios were successfully prepared. The effects of these ratios in these 3D LDH constructions on physicochemical properties were investigated using XRD, SEM, VSM, UV–vis, and BET analyses. The specific surface area and band gap of these materials decreased with increased ratio, while the saturation magnetization increased. The synergistic combination of saturation magnetization, adsorption characteristics, and band gap of six sample types were evaluated. S3 samples were used in a multistage recycling treatment study of dye wastewater and fluoride ion (F − )-containing wastewater, effectively degrading methyl orange (MO) due to its high photocatalytic activity. After this, the memory effect of the calcined product (S3, 300 °C) significantly enhanced the migration and diffusion of F − , resulting in a F − adsorption capacity of 49.25 mg/g. The recycling properties of this composite material for photocatalytic degradation and adsorption capabilities for F − removal were evaluated, showing a reduction in efficiency of only 1 % and 8.6 % for degradation of MO and F − removal respectively, with no significant loss of efficiency after 10 cycles. Adsorption experiments and subsequent sample characterization showed that the F − adsorption mechanism of S3 involved ion exchange mechanism and sorption sites (interlayer, basal, edges and junction sites). The existence of oxygen vacancies and formation of S-scheme heterojunction between γ-Fe 2 O 3 -Cd 2+ -Ni 2+ -Fe 3+ -LDH and Ni 2+ -Al 3+ -LDH, resulted in the improvement of the photocatalytic activity. The results obtained in this study demonstrated that Ni 2+ -Al 3+ -LDH/γ-Fe 2 O 3 - Cd 2+ -Ni 2+ -Fe 3+ -LDH composites were a promising adsorbent for degradation of MO and F − removal in practical multilevel utilization due to its simple synthesis, low-cost, recyclability, and high removal capability.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 34
·47099-47106
·
IF 4.223
Jiang Wenqi,Yao Guojun,Jing Xu,Liu Xueke,Liu Donghui,Zhou Zhiqiang
Heavy metals may coexist with pesticides in farmland through wastewater irrigation, application of pesticides and chemical fertilizers, or unappropriated waste disposal. Heavy metals are toxic to soil microorganism, which may influence the environmental behavior of pesticides subsequently. In this study, the influence of Cd 2+ and Pb 2+ on the degradation of α-cypermethrin and its metabolites, 3-phenoxphenoxybenzoic acid (3-PBA) and 3-(2’,2’-dichlorovinyl)-2,2-dimethylcyclopropane carboxylic acid (DCCA), were investigated through soil incubation experiment. It was found heavy metals like Cd 2+ and Pb 2+ will inhibit the degradation of α-cypermethrin, especially at high concentrations. Pb 2+ has a stronger inhibitory effect on the degradation of α-cypermethrin than Cd 2+ in the same concentration. With the presence of 10 mg/kg Pb 2+ , the half-life of α-cypermethrin increased from 41.1 to 99.9 days, even the half-life was 129.3 days with 50 mg/kg of Pb 2+ . Besides, heavy metals influenced the chiral selective degradation of α-cypermethrin. The enantiomer fraction was near 0.5 when 10 mg/kg of heavy metals existed. Furthermore, the adverse effects of heavy metals on soil urease, catalase, and sucrase activity were assayed. In tested concentrations (10 and 50 mg kg -1 ), the heavy metals result in strong inhibition of the activity of the enzymes present on soil, jeopardizing the biodegradation by the microbiome and which may inhibit the degradation of α-cypermethrin.
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BIOSENSORS & BIOELECTRONICS
·
2017
·
IF 7.78
Zhuoyue Zhang,Zhen Zhang,Huihui Liu,Xiang Mao,Wei Liu,Shouting Zhang,Zongxiu Nie,Xiaoquan Lu
Visual inspection is expected as an ideal technique, which can directly and conveniently detect heavy metal ions by observing the color change. Insensitivity of detecting weakly colored heavy transition metal ions and low adsorptivity of metal ions on nanoparticle surface are two main factors hindering the application of visual detection in heavy metal ions detection. Herein, we demonstrated an operational colorimetric sensor based on the color dependence of nanoparticles aggregation to selective and facile detect weakly colored transition heavy metal Cd 2+ ions that have been considered as the origin of the “Itai-itai” disease. Uniform colloidal 15 nm graphite-like nitride doped carbon quantum dots-capped gold nanoparticle (Au@g-CNQDs) was successfully prepared, wherein the existence of numerous heptazine, carboxyl and hydroxyl groups on the nanoparticle's surface strengthened adsorption of the Cd 2+ ions on the surface of Au@g-CNQDs through the “cooperative effect”. As a consequence, without expensive and intricate exogenous indicators or other special additives, the Cd 2+ ions could sensitively and quickly captured to detect at ultra-low concentration within 30 s by the naked-eye. Under the optimal conditions, the Cd 2+ ions sensor possesses good analytical performances with a wide linear range of 0.01–3.0 μM and a detection limit of 10 nM (S/N = 3). Moreover, the biodistribution and aggregation of Cd 2+ ions were detected effectively in mice organ tissues suggesting its great potential use for real-word applications.
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